package com.hmdp.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.hmdp.config.RedissonConfig;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.Voucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.service.IVoucherService;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.SimpleRedisLock;
import com.hmdp.utils.UserHolder;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.aop.framework.AopContext;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.lang.reflect.Proxy;
import java.time.LocalDateTime;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {

    @Resource
    private ISeckillVoucherService seckillVoucherService;
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Resource
    private RedisIdWorker redisIdWorker;

    @Autowired
    private RedissonClient redissonClient;

    @Override
    public Result seckillVoucher(Long voucherId) {
        //1.查询优惠卷
        SeckillVoucher seckillVoucher = seckillVoucherService.getOne(new LambdaQueryWrapper<SeckillVoucher>()
                .eq(SeckillVoucher::getVoucherId, voucherId));
        //2.判断秒杀是否开始
        if (seckillVoucher.getBeginTime().isAfter(LocalDateTime.now())) {
            return Result.fail("秒杀暂未开始");
        }
        //3.判断秒杀是否结束
        if (seckillVoucher.getEndTime().isBefore(LocalDateTime.now())) {
            return Result.fail("秒杀已结束");
        }
        //4.判断库存是否充足
        if (seckillVoucher.getStock() < 1) {
            return Result.fail("库存不足111");
        }

        Long userId = UserHolder.getUser().getId();
        //创建锁对象
//        SimpleRedisLock lock = new SimpleRedisLock("order:" + userId, stringRedisTemplate);
        RLock lock = redissonClient.getLock("lock:order:" + userId);
        //获取锁
        boolean isLock = lock.tryLock();
        if (!isLock){
            //获取锁失败，返回错误信息
            return Result.fail("不允许重复下单");
        }

        try {
            //获取代理对象（事务）
            IVoucherOrderService proxy = (IVoucherOrderService) AopContext.currentProxy();
            return proxy.createVoucherOrder(voucherId);
        } finally {
            lock.unlock();
        }
    }

    @Override
    @Transactional
    public Result createVoucherOrder(Long voucherId) {
        //5.1 一人一单
        Long userId = UserHolder.getUser().getId();
        int count = lambdaQuery().eq(VoucherOrder::getUserId, userId)
                .eq(VoucherOrder::getVoucherId, voucherId).count();
        if (count > 0) {
            return Result.fail("用户已经购买过");
        }
        //5.减扣库存
        boolean success = seckillVoucherService.lambdaUpdate()
                .setSql("stock = stock - 1")
                .eq(SeckillVoucher::getVoucherId, voucherId)
                .gt(SeckillVoucher::getStock, 0)
                .update();
        if (!success) {
            return Result.fail("库存不足");
        }

        //6.创建的订单
        VoucherOrder voucherOrder = new VoucherOrder();
        long orderId = redisIdWorker.nextId("order");
        //6.1订单id
        voucherOrder.setId(orderId);
        //6.2用户id
        voucherOrder.setUserId(userId);
        //6.3代金卷id
        voucherOrder.setVoucherId(voucherId);
        save(voucherOrder);

        //7.返回订单id
        return Result.ok(orderId);
    }
}
